E.
Prepare for the Procedure

 S 048-014-N00
 WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 018-002-N00

 (2)  
Open the fan cowl panel (AMM 71-11-04/201).

 S 018-003-N00

 (3)  
Open the core cowl panel (AMM 71-11-06/201).

 S 018-015-N00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
Open the thrust reverser (AMM 78-31-00/201).

 F.
Repair the Diffuser Case Assembly

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A

A 
FWD 
A  1 
45` 
A  1 
338` 
82` 
A  2 
A 
93`  1 
A  277` 
3 

128`
A1
A1
225`
172`
1
AP8 BORESCOPE ACCESS PORT
A1
2 3  AP9 BORESCOPE ACCESS PORT IMMERSION THERMOCOUPLE  A-A (VIEW IN THE AFT DIRECTION)  L-A6338 
Boss Thread Repair 
Figure 801 (Sheet 1) 

D19576
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

L-A6339
C-C
Boss Thread Repair Figure 801 (Sheet 2)
D19578
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S 328-005-N00
 CAUTION: THE THICKNESS OF THE BOSS WALL CAN NOT BE LESS THAN 0.100 INCH
_______
 (2.5 MM). IF YOU DRILL TO A DEPTH WHICH IS MORE THAN 0.545 INCH (13.843 MM), THE LIFE OF THE CASE WILL BE DECREASED.
 (1)  Do these steps to machine the damaged threads (Fig. 801).
 NOTE: The areas which are machined must be not more than
____
 0.010 inch (0.254 mm) in all directions from the correct position of surface A. The areas must also not be more than
 0.010 inch (0.254 mm) in all directions from the original location of the minor diameter of the damaged thread.
 (a)  
Attach a shop vacuum cleaner to the PWA 81441 Reamer Guide.

 (b)  
Install the PWA 81442 Special Reamer in the PWA 81441 Reamer Guide.

 (c)  
Use a standard electric drill to machine the damaged threads.

 (d)  
Remove the PWA 81442 Special Reamer for the PWA 81441 Reamer Guide and install the PWA 81443 Special Reamer.

 (e)  
Use a standard electric drill to machine the damaged threads.

 S 328-006-N00
 (2)  
Do the steps that follow to tap the boss threads (Fig. 801).

 (a)  
Attach a shop vacuum cleaner to the PWA 81439 Tap Guide.

 (b)  
Attach the tap in the PWA 81439 Tap Guide.

 (c)  
Tap the boss thread.

 (d)  
Remove the tap form the PWA 81439 Tap Guide and install the bottoming tap in the hole.

 (e)  
Tap the boss thread.

 (f)  
Remove all of the particles.

 S 228-007-N00
 (3)  
Use a thread plug gage to do an inspection of the threads.
　
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